Introduction
In the day-to-day of a system administrator or a developer working on the Linux command line, it is frequent to need to know exactly which binary is being executed when a command is invoked. The shell looks for the executable in the paths defined by the PATH variable, but sometimes there are multiple versions of the same program (for example, a system installation and another in /usr/local/bin) or one wants to confirm that the expected path is being used. The
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